Which properties could you use to solve the following expression?
3 + 7 + 2 + 5 + 9

Let w=23 . what is the value of w + 45 ?

Can someone tell me if this is perpendicular? !

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?